Elektor Team (9503)

1-07-1989 | 050 SIMPLE VARIABLE POWER SUPPLY This low-cost power supply has an output voltage range of 1.5-15 V at a maximum current of 500 mA. Regulati...

1-07-1989 | 051 GENERAL INTEREST D4 11441 48 I S1 15 09 013 1C3 4060 PI 0 5V 0 Bz O R8 680n BC547B 11•111•11 894071 - 11 DL TOnTOOR 16V 03 Re1 1N414...

1-07-1989 | 052 IMPROVED LOW FUEL INDICATOR The indicator described here obviates the flickering of the "low fuel" warning light on the dashboard caused...

1-07-1989 | 053 AUDIO & HI-FI A vox is a voice-operated switch that is often used as a substi- tute for the press-to-talk switch on a microphone. The on...

1-07-1989 | 054 LOW-NOISE MICROPHONE PREAMPLIFIER The microphone preamplifier described is based on the SSM2015 from Precision Monolithics Inc. (Pmi), w...

1-07-1989 | 055 HIGH-VOLUME ALARM When this alarm is actuated by a low-level signal at input W, the (FiF) loudspeaker produces a number of 4-tone sequen...

1-07-1989 | 056 MAINS POWERED TIMER This timer may be inserted in a power line to provide a controllable delay before a load is energized. It was develo...

1-07-1989 | Cl D1 10n 15n 22n (loon R2 LSLK en 01...03 = 1N4148 BC547 T2 N1...N4 = ICI = 4093 R8 "Cl C8 0W5 R3 R4 00 135 057 SINGLE-CHIP MELODY GENERATO...

1-07-1989 | 058 INFRA-RED MICROPHONE The circuit of this microphone was originally designed to mon- itor a 7-segment display used on the flight deck of...

1-07-1989 | 38 059 FOUR-QUADRANT DIMMER This very special mains-operated dim- mer for domestic or industrial lights is not available in proprietary form...